ci: remove double up on git repo

Author: tommytroen

.github/workflows/publish-release.yml

@@ -5,7 +5,7 @@ on:
     types: [published]
 
 env:
-  IMAGE_BASE_NAME: docker.pkg.github.com/${{ github.repository }}/${{ github.repository }}
+  IMAGE_BASE_NAME: docker.pkg.github.com/${{ github.repository }}
 
 jobs:
   publish-release: